Draw block mechanism



June 5, 1956 E. J. M ILVRIED DRAW BLOCK MECHANISM 6 Sheets-Sheet 1 FiledFeb. 28. 1952 INVENTOR.

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June 5, 1956 E. J. MQILVRIED' DRAW BLOCK MECHAN-ISM 6 Sheets-Sheet 2Filed Feb. 28, 1952 .0 mm NR WV mm M J w w w QZZWQL ATT RNEYS.

June 5, 1956 E. J. M ILVRIED 2,748,924

DRAW BLOCK MECHANISM Filed Feb. 28, 1952 6 Sheets-Sheet 5 l/VVENTORByfDW/N J. M IL VR/ED ATTO IZNEYfi.

June 5, 1956 J MCILVRIED 2,748,924

DRAW BLOCK MECHANISM Filed Feb. 28, 1952 6 Sheets-Sheet 4 ill (Q.3 2INVENTOR.

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June 5, 1956 E. J. M ILVRIED DRAW BLOCK MECHANISM Filed Feb. 28. 1952 6Sheets-Sheet 6 INVENTOR. EDP/0V J. Mll. VR/ED ATTORNEYS.

United States Patent DRAW BLOCK MECHANISM Edwin J. Mcllvried, GrangerTownship, ()hio, assignor to The Vaughn Machinery Company, CnyahogaFails, Ohio, a corporation of Ohio Application February 28, 1952, SerialNo. 273,966

20 Claims. (Cl. 205-3) This invention relates as indicated to draw blockmechanism, and more particularly to a draw block especially adapted anddesigned for the drawing of metal tubing, both ferrous and non-ferrous.

It is common practice to draw tubing through a die provided with aninternal plug on a mandrel bar to elongate and reduce the tubing, butusually this operation is performed on a straight draw bench which iscapable of handling but relatively short lengths of tubing. On the otherhand, wire and the smaller sizes of relatively thickwalled tubing havelong been drawn through dies by means of a rotating drum or draw block,but with thin-walled tubing much difi'iculty has been encountered due tobreaking off at the die. When drawing tubing by means of a draw block, asimple die may be employed to perform a sinking operation or a floatingplug may be used to establish a definite wall thickness. When such plugis utilized it becomes of especial importance to pull the tubing in amanner to maintain an accurate axial alignment of the tubing, die, andplug to prevent pinching and breaking of the tubing in the die. Wheninitiating the draw this problem is particularly critical as breakagedue to misalignment is most apt to occur when the plug is first seatingitself in the die.

The gripper on the block which holds the leading end of the work shouldnot be permitted to swing against the smooth polished side of the blockor scratching of the latter will result with consequent scratching ofthe tubing in mechanism where the turns of the latter about the blockare caused to slide axially of the block.

It is highly desirable to obtain several snug turns of the tubing aboutthe block in order to ensure a secure purchase thereon before the turnsare caused to slide axially of the block as additional turns are woundon the latter. While not as important, this is also advantageous in thedrawing of rod and wire and it is to be understood that the mechanism ofmy invention, while especially useful in the drawing of tubing, is alsosuited for the drawing of rod, wire and the like.

It is accordingly a principal object of my invention to provide drawblock mechanism especially adapted for the drawing of metal tubingwherein the initial pull exerted on the work will be in a straight-linedirection.

Another object is to provide such mechanism by which one or more turnsof tubing may be wound upon the draw block without any initial shiftingof such turns axially of the block but which will be effectivethereafter thus axially to shift the accumulated turns.

A further object of my invention is to provide draw block mechanismadapted to draw relatively large diameter metal tubing without damage tothe latter and ensuring a uniform high quality product.

Still another object is to provide such mechanism in which the drum andgripper mechanism are arranged and designed to prevent scratching of thetubing wound upon the former.

Other objects of my invention will appear as the descriptien proceeds.

1 2,748,924 Patented June 5, 1956 To the accomplishment of the foregoingand related ends, said invention then comprises the features hereinafterfully described and particularly pointed out in the claims, thefollowing description and the annexed drawing setting forth in detailcertain illustrative embodiments of the invention, these beingindicative, however, of but a few of the various ways in which theprinciple of the invention may be employed.

In said annexed drawing:

Fig. 1 is a general perspective view of my new mechanism;

Fig. 2 is a vertical section taken through the draw block along the line22 on Fig. 3 and also showing the circular guard or shield which may beprovided to enclose the same as a safety precaution;

Fig. 3 is a top plan view of such draw block and the associated diehousing;

Fig. 4 is a diagrammatic top plan of such block and die housingillustrating several positions of the same and the gripper means on theblock immediately following initiation of the drawing operation;

Fig. 5 is a vertical section on a somewhat enlarged scale through suchdie housing and the mounting means therefor;

Fig. 6 is a fragmentary vertical section through the block and grippermeans mounted thereon;

Fig. 7 is a fragmentary detail View of the gripper means taken on theline 7-7 on Fig. 3;

Fig. 8 is a fragmentary detail view of the cam and follower on suchblock and die housing respectively, taken on the line 33 on Fig. 3; V

Fig. 9 is a horizontal section through the drive means of the blocktaken on the line 9-9 on Fig. 2; and

Fig. 10 is a fragmentary elevation partly in section of the grippersupporting means taken on the line 1010 on Fig. 3.

General construction and operation Referring now more particularly tothe drawing and especially Fig. 1 thereof, the embodiment of myinvention there illustrated comprises a large diameter block or drum Imounted for rotation about a vertical axis in box frame 2 which is alsoadapted to serve as a gear case, lubricant being introduced throughfiller pipe 3; Such drum or block is adapted to be driven by means of apowerful electric motor 4 mounted on base 5 and provided with an airfilter 6 through which cooling air is adapted to be drawn by a fan (notshown) within the motor housing for ventilating such motor. A die holder7 is carried in a trunnion mount 8 supported in base frame 9 and stand10 bolted on such frame.

A riding stripper 11 is adapted to be mounted on the block as shown, sothat a large number of turns of tubing may be accumulated thereon. Awork-piece gripper generally indicated at 12 is mounted forreciprocation vertically of a tubular supporting column 13, a slot 14extending part-Way into drum 1 from the upper edge thereof permittingsuch gripper to slide downwardly to a point approximately one-third thevertical extent of such drum above apron 15. In mechanism designed forthe drawing of two-inch diameter aluminum tubing, for example, drum 1may be approximately nine feet in diameter.

The tubing to be drawn will be conducted through loop 16, pivoted at 17,and its leading end pinched for insertion through the die in die holder7. The leading end of the tube protruding through the die will be seizedby gripper 12 in the position shown in Fig. l and block 1 then driven ina counterclockwise direction to pull the a manner described belowwhereby the work will be initially pulled through the die with a uniformstraightline pull thereon.

As block 1 turns, die holder mounting 8 is caused to drop until the dieis generally aligned with the lowermost exposed portion of block 1 sothat the first turn or two of tubing will be wound on the block in adownward direction until push-up apron is encountered. The die thenremains in this lowermost position and succeeding turns of tubing woundupon the drum act to slide the previously accumulated turns upwardlyaxially of the A drum, gripper 12 moving upwardly therewith on itssupporting column 13. After a large number of turns have beenaccumulated (and ordinarily after the work has been drawn entirelythrough the die), gripper 12 will be released and the riding stripper 11will be lifted from the drum with such accumulation. A new drawingoperation may then be commenced after returning the gripper to the Fig.1 position in slot 14 and again elevating the die mount 7 into alignmenttherewith. A circular enclosing guard or shield 18 (Fig. 2) willdesirably be provided to enclose the block as a safety precaution, adoor therein affording convenient access.

Draw block operating means Referring now more particularly to Figs. 2and 9 of the drawing, block 1 is keyed to a vertical spindle 19journalled at its lower end in thrust bearing 20 and also supported at21 in the upper portion of frame 2. Drive shaft 22 from motor 4 isjournalled in frame 2 at 23 and 24 with worm 25 thereon in drivingengagement with worm gear 26 keyed to spindle 19.

The push-up apron 15 designed positively to force the turns of tubing onthe block upwardly thereof as such block rotates may be of the generaltype shown and described in my co-pending application Serial No.196,806, now Pat. No. 2,658,611 granted November 10, 1953 filed November21, 1950. Briefly, such apron comprises a ring having a hardened insert27 adjacent the face of the block, such ring being journalled onbearings 28 and 29 generally concentric with the axis of spindle 19 butslightly inclined thereto. The block and apron are interconnected forrotation together by means of a heavy coil spring 30 fitting in opposedsockets 31 and 32 in such drum and apron respectively. Such spring willpermit a degree of rocking action of such apron relative to the drumwhile causing the apron to be turned by rotation of the drum. Variousother forms of wobble connections may be utilized instead of suchspring, including a wobble pin, for example. It will accordingly be seenthat as the tubing is wound upon the rotating drum (after the die holderhas been lowered to lowermost position) the lowermost turn will beengaged by apron 15 and forced upwardly along the surface of the drumthrough the relative rocking action of the apron.

The riding stripper While block or drum 1 may be provided with aplurality of upstanding pins to increase its capacity for accumulatingturns thereon, and a stripper subsequently inserted in well-known mannerto lift the accumulated bundle from the drum, in the embodimentillustrated I have provided a riding stripper 11 adapted to be mountedon the block prior to the drawing operation so that upon completion ofthe latter the accumulated bundle of tubing may at once be lifted fromthe block. As best shown in Figs. 1 and 2, such stripper may comprise avertical tubular center member 33 adapted to be seated upon the taperedextension 34 of spindle 19. A plurality of feet 35, in this case five,are pivotally attached at 36 to members 37 welded to the lower end oftube 33 and braced by flanges such as 38 and 39. Corresponding verticallinks 40 are pivotally connected at 41 to the respective feet and at theupper ends to a spider 42 slidably mounted on the upper end portion oftube 33, the downward extent of such sliding movement being limited bycollar 43. When the riding stripper is in course of being mounted on thedrum, being suspended from an overhead crane by means of clevis 44,spider 42 will rest against collar 43 and the feet 35 will accordinglybe folded inwardly. It is accordingly thus feasible to insert suchstripper within a bundle of tubing which has accumulated on the drum andpins (not shown) extending upwardly therefrom. When the feet engage thesloping bottoms 45 of the slots 46 designed to recoive the same, theyare cammed outwardly so that the outer end such feet project into slots47 in apron This action likewise causes spider 42 to slide upwardlyalong tube 33 so that pin 48 will likewise be caused to slide upwardlyin slot 49 in such tube into position to be engaged and there locked bylatch 50. Feet 35 will accordingly now be held in their outwardlyprojecting positions to support the bundle of tubing when the stripperis lifted from the drum.

The die mounting Referring now more particularly to Figs. 1, 3 and 5,the die holder 7 is carried in horizontal trunnion bearings 51 and 52 onmount 8, and such mount 8 is in turn supported by vertical trunnions 53and 54 journalled respectively in base frame 9 and upper stand 10 boltedon such frame. Bellows 55 enclose trunnion 53 where the latter projectsabove the upper surface of base frame 9, and bellows 56 enclose trunnion54 where the latter is exposed between mount 8 and bearing 57 on stand10.

Provision is made for vertical sliding movement or reciprocation oftrunnions 53 and 54 in their respective bearings 58 and 57, wherebymount 8 and thus die holder 7 may be positioned in either elevated orlower position as desired. In Fig. 1 it will be noted that the mount andthe holder are shown in elevated position whereas in Fig. 5 the same areillustrated in their lower position. A fluid pressure piston-cylinderassembly is mounted in base frame 9 comprising a cylinder 59 and apiston having a vertically extending rod 60 engaged with and adapted toP pport lower trunnion 53. By stepping on foot valve 61, fluid pressuremay be admitted to the lower end of cylinder 59 to elevate mount 8 anddie holder 7 as shown in Fig. 1. Such valve is of the type which staysin the position in which it is thus set until reversed in the mannerexplained below.

The die holder 7 is of generally conventional design, and its preciseconstruction is not a part of the present invention. A die seatingmember 62 is supported within holder 7 and itself carries the die 63through which the ork is to be drawn. A plurality of generally U-shapedspacer members 64 are clamped against member 62 by means of slottedhand-wheel 65 having an axial opening 66 therethrough aligned with die63. A valve 67 may be turned as shown in Fig. 5 to permit lubricant todrain to the trough-shaped lower portion of mount 8 whence it may flowthrough downwardly extending tube 68 into enclosure 69 in base frame 9and thence to sump.

As best shown in Figs. 1, 3, 4 and 8, an upstanding member 70 mounted onbase frame 9 is adapted to engage the rear side of trunnion mount 8 tolimit swinging movement of the latter in a counterclockwise position asviewed in Figs. 3 and 4. A tension spring 71 acts resiliently to holdmount 8 against stop 70.

A cam roller 72 is mounted for rotation about a vertical axis in a smalldepending bracket 73 on trunnion mount 8 where the latter most nearlyapproaches the side of apron 15 encircling drum 1. An arcuate cam track74 is bolted to the side of such apron in position to engage roller 72when mount 3 is in elevated position as shown in Fig. 1, although suchroller will be unable thus to engage such cam when mount 8 has beenlowered as above described. As best shown in Fig. 4, rotation of drum 1and apron 15 in a counterclockwise direction (arrow) will thus serve torock mount 8 and die holder 7 first in a clockwise direction about thevertical axis of trunnions 53 and 54 and then back again until cam track74 no longer engages roller 72, whereupon spring 71 is eflfective tohold mount 8 in engagement with stop 70. In this latter position theaxis of die 63 will be aligned substantially tangentially of theperiphery of drum 1. In actual practice, the projected axis of such diewill be spaced from such point of tangency by an amount equal to theradius of the tubing being Wound upon the drum.

The tube gripping means The work-piece gripper generally indicated at 12in Fig. 1 is shown in more detail in Fig. 7 and comprises a generallytubular slide 75 mounted on tubular column 13 for movement up and downthe latter. A counterweight 76 within such column is connected to slide75 by means of cable 77 passing over pulley 78 carried by swivel 79 atthe top of the column (in broken Figs. 2 and 6 such counterweight isshown at its lowermost position within column 3 but it will beunderstood that such will only be the case when slide 75 and gripper 12have moved to an upper position on such column, and conversely when suchslide and gripper are in lowermost position as shown such counterweightwill in fact be in its uppermost position). A collar 80 is secured tocolumn 13 to limit movement of slide 75 in an upward direction.

A member 81 is pivotally mounted at 82 on a lateral projection 83 ofslide 75, such projection being provided with a curved end portionadapted to engage a stop 84 mounted in member 81 adapted to limitswinging movement of member 81. The upper jaw member 85 of the gripperproper is pivotally mounted at 86 on the outer end of member 81 and isprovided with a rigid upstanding handle 87. The lower jaw member 88 isjoined to such upper jaw member by means of two pairs of links 89 and90, one of the latter having an upward extension 91 adapted to serve asa handle similarly to handle 87. A tension spring 92 extending from suchlatter handle 91 and secured to upper jaw member 85 normally serves toswing such links to bring lower jaw member 88 into cooperative grippingrelationship relative to upper jaw member 85. As shown in Fig. 7, suchlinks need not be arranged to bring the two jaw members into actualengagement inasmuch as the work to be gripped is of substantialthickness. It will be seen that the operator, by squeezing handles 87and 91 together may space jaws 85 and 88 to release the work but that,when the pressure on handle 91 is released, jaw 88 will automaticallymove to grip the work cooperatively with jaw 85 and the exertion of apull upon the work-piece will merely serve to enhance the grippingaction.

A tubular post 93 (Figs. 3 and is mounted on flange 94 of drum 1adjacent tubular column 13, a vertical section of tube 93 being cut awayon the side toward projection 83 of slide 75. A flat-faced bar 95 isfitted within tubular post 93 for swiveling action about its verticalaxis and provided with a wear strip 96 secured to such fiat face. Aroller 97 is mounted for rotation about a horizontal axis in a bracketon projection 83 of slide 75 and is adapted to engage such wear member96 to prevent swinging movement of slide 75 and members 81 and 83 aboutthe axis of column 13 during the initiation of the drawing operationwhen such members 81 and 83 will be projecting through slot 14 in drum 1as shown in Figs. 1

and 3. After sufiicient turns of tubing have been wound upon the drum tocause the gripper to move upwardly out of slot 14, such support of thegripper is no longer required and roller 97 will rise above the top ofpost 93 and be inoperative thereafter.

Operation Other elements of the construction may best be understood inconnection with a consideration of the operation thereof.

With drum 1 turned to a position generally as shown in Fig. 1, theoperator will pull the gripper device down into slot 14 until slideengages base 98 seating column 13 in flange 94 of drum 1 (Figs. 6 and10). The operator next steps on foot valve 61 to actuate the fluidpressure piston-cylinder assembly 59 to elevate trunnion mounting 8 toits uppermost position as likewise shown in Fig. 1. The tube will beindented slightly at a point spaced some what from its leading end and alubricant injected into the tube. Then the leading end of the tube willhave a floating bulb or plug inserted therein and the extreme end willbe swaged and pointed for insertion through die 63. Such leading end ofthe tube is then passed through loop 16 from left to right as viewed inFig. l and threaded through passage 66 of clamping member 65. When thedrawing operation is initiated the plug will automatically advance intoproper position relative to the die and thereafter maintain suchposition.

The member including loop 16 is pivoted on base frame 9 at 17 and itslower end is engaged beneath stop 99, a tension spring 100 assisting inmaintaining such member in this position. A limit switch (not shown),operable by rotation of fulcrum pivot 17, is adapted immediately to stopthe machine when. loop 16 is rocked toward the die. This device is aconventional safety feature more or less standard in drawing machinesand is not itself a part of my invention.

When slide 75 is against stop 98, the gripping device carried therebywill project through slot 14 in drum 1' at a point a very short distanceabove the bottom of such slot as shown in Fig. 6 and at a levelcorresponding to that of die 63 and the tube end projecting through thelatter when the die mount has been elevated as above described. Theoperator now inches drum 1 in a forward direction (counterclockwise asshown in Figs. 3 and 4) to bring dog 101 past the grip position limitswitch operating lever 102 (i. e. to the right of the latter as viewedin Fig. 3) mounted on the housing of the machine. This sets up themachine. Now inching drum 1 in the opposite (clockwise) direction, dog101 will engage limit switch operating lever 102 to set air brake 103 tostop motor 4 with the gripper in the precise position for initiation ofthe drawing operation, as shown in Fig. 3. Dog 101 is mounted on apron15 of drum 1 for a limited adjustment in its position peripherally ofsuch apron to permit exact determination of the point where the gripperthus stops.

The operator manually squeezes handles 87 and 91' of the grippertogether further to space jaws S5 andv 88 to receive the pointed end ofthe tube which projects through the die. When such handles are released,spring 92 serves to hold the lower jaw in firm clamping engagement withthe work.

The start button may now be pressed and subse quent operation of themachine is automatic. Referring more particularly to Fig. 4 of thedrawing, several stages in the initiation of the drawing operation arethere indicated, the gripper and die mounting being shown in solid linein their positions immediately before starting rotation of the drum. Asthe drum starts to turn, cam

74 on apron 15 rocks mount 8 in a clockwise direction about its verticaltrunnion bearings at a rate and to an extent comparable to the arcuatepath of the gripper means so that the die will be held in exactalignment therewith. It will consequently be appreciated that the tubewill be drawn through the die in a straight line during the initialstages of the drawing operation and out of contact with the surface ofdrum 1 until the side of the tube engages the block so that there is notendency to pinch and break the tube in the die. Once the drawingoperation has been thus initiated, the tube may be wound upon the drumwithout damage thereto. As indicated in Fig. 4, the gripper willcontinue its travel on an arcuate path until the side of the tubeengages drum 1, die mount 8 having now swung back into original startingposition so that the tube passes through the die on a line tangential tothe side of the drum.

After the drum has made approximately onethird of a revolution (androller 72 is no longer in engagement with cam 74'), the small dog 104 onthe side of. apron 15 below cam 74 (Fig. 3) willengage lever 195 tooperate valve 61 through a series of links and levers 1% (Fig. 1) toadmit fluid to double-acting. piston-cylinder assembly 59 to lower diemount 8 from the Fig. 1- position to the Fig. 5 position. The rate oflowering of the die will be regulated to ensure that the cam followerroller 72 will be below the level of cam 74 by the time drum 1 has madea complete revolution. Die mount 8 will accordingly not be again rockedas it was at the initiation of the drawing operation but will be held byspring 71 firmly against stop 70.

Generally after about one to three turns of the drum, depending upon thediameter of the tubing and. other considerations, the tubing will engagethe surface of pushup apron 15 (this coinciding with the lowermostposition of the die) and the accumulated turns on the drum will now bepushed upwardly as the drum continues to turn, lifting the gripper 12therewith. After sufficient turns have accumulated, the gripper willhave been lifted beyond the top of the drum and out of engagement withits supporting post 93, but sufficient turns will now be wound upon thedrum toafford a non-slip grip for continuing the drawing operationwithout any substantial tension on the gripper.

Depending on the tube diameter and other circumstances, the accumulatedturns may or may not tend to nest as they rise above the top of drum 1and are thereafter supported on upstanding pins or the legs of a ridingstripper. When the trailing end of the tube pulls through the die, itwill strike a rubber-surfaced plate 107 hinged about a vertical axis andthereby operate a limit switch to apply dynamic braking or load brakingto stop motor 4.

The operator nowinches the drum in a forward (clockwise) direction tobring the gripper into a conveniently accessible position, ordinarilymore or less vertically above the position shown in Fig. 1, releases thegripper from the tube end andfolds it back out of the way by swingingmembers 85 and 81 about their respectpivots 86 and 82. Clevis 44 of theriding stripper may now be engaged by the hook of an overhead crane andthe bundle of tubing lifted from the machine. The operator again pullsthe gripper down into slot 14 and operates valve 61 to elevate the dieto starting. position, whereupon he is ready to commence a new drawingcycle as above described.

It will thus be seenthat I have provided mechanism for the drawing oftubing which is adapted to handle much longer lengths of tubing than ispossible on the usual straight draw bench and at a much higher rateofspeed. Moreover, my new mechanism doesnot have the disadvantages whichhave been encountered in the past when attempting to employ draw blocksfor the drawing of tubing, and more particularly danger of damaging thetubing during initiation of the drawing operation is avoided. The tubingis wound in a downward direction upon the rotating block beforetheaccumulated turns'are started sliding upwardly of the block. Sincethe gripper never swings into contact with the outer surface of the drawblock, the latter stays smooth and highly polished and scratching of thetubing woundthereon is avoided.

While particularly advantageous for use inthe drawing of tubing, andespecially relatively thin-walled tubing of the larger diameters, my newmechanism may also be utilized in the drawing of rod, wire and the likeThe jointed arm composed ofmembers 81 and 83 projectsrigidly outwardlyfrom the surface of block. 1 sufiiciently, and the pivoted work grippingmember 85 is short enough, that the work gripping-means does not swingin. against such surface when in a position tangential thereto (see Fig.4). The vertical'trunnions 53, 54 and the horizontal trunnions 51, 52afford a dual swivel action which permits the die to be maintained inalignment with the pull exerted on the work. The mounting of the workgripping means outwardly from the surface of the block and the movementof the die transversely of the axis of such block serve to hold the workout of contact with the block surface for a longer period than wouldotherwise be the case during the initial stage of the drawing operation.By winding one or more turns of the work on the block before such turnsare caused to slide along the block, the frictional engagement of thework and the block becomes sufiicient to maintain the necessary pulltherefore and relieves the strain on the gripper, making it easier forthe latter to travel upwardly.

Other modes of applying the principle of the invention may be employed,change being made as regards the details described, provided thefeatures stated in any of the following claims or the equivalent of suchbe employed.

I therefore particularly point out and distinctly claim as my invention:

1. The method of drawing elongated work which comprises threading theend thereof through a die, securing such end for winding on a rotatabledrum to draw such work through such die, rotating such drum to wind suchwork thereon, shifting such die relative to the longitudinal extent ofsuch drum to wind such work toward one end of such drum, stopping suchshifting movement of such die, and thereafter shifting all theaccumulated turns of work, including such end of the work, bodily alongsuch drum in the axial direction opposite to that in which such die wasshifted while continuing to wind work thereon.

2. The method of drawing tubing which comprises threading the endthereof through a die with a floating mandrel bulb therein immediatelybehind such die, securing such end for winding on a rotatable drum todraw such tubing through such die, rotating such drum to wind suchtubing thereon, holding such end of such tubing spaced outwardly fromthe surface of such drum to ensure a uniform straight pull on suchtubing during initiation of the operation, rocking such die about anaxis parallel to the axis of such drum to maintain alignment of such dieand tubing during initiation of the drawing operation. shifting such dierelative to the longitudinal extent of such drum to wind such tubingtoward one end of such drum without slipping of the turns of tubingrelative to the latter, stopping such shifting movement of such die, andthereafter pushing all the accumulated turns of tubing, including suchend of the tubing, bodily along such drum in the axial directionopposite to that in which such die was shifted while continuing to windtubing thereon.

3. In mechanism for the drawing of elongated work such as tubing and thelike, including a die and a rotatable block adapted to be driven to windsuch work thereon to draw the same through such die; means adjacent oneend of said block adapted to engage work wound on said block to forcethe turns of work to slide axially of said block, die mounting means,means operative to shift said die mounting means from a startingposition selected initially to wind work on said block in a regionspaced from said work-engaging means to a position to wind work on saidblock in engagement with said work-engaging means, andwork-grippingmeans on said block mounted for movement axially of said block from suchstarting position in a direction away from said work-engaging means,whereby work may initially be wound on said block in one axial directionto engage said work-engaging means and thereafter the accumulated turnswill be bodily axially shifted in the other direction together with saidworkgripping means.

4. In mechanism for the drawing of elongated work such as tubing and thelike, including a die and a rotatable block adapted to be driven to windsuch work thereon to draw the same through such die; a push-up apron atone end of said block adapted to engage work wound on said block toforce the turns of work to slide axially of said 9 block, die mountingmeans mounted for oscillation about an axis parallel to that of suchblock, means operative to shift said die mounting means; along suchfirst axis from a starting position selected initially to wind work onsuch block in a region spaced from said apron to a position to wind workon such block in engagement with said apron, whereby accumulated turnsof work on such block will not be bodily shifted axially of such blockuntil said apron is thus engaged, and work-gripping means on such blockmounted for movement axially of such block from such starting positionin a direction away from said apron, said work-gripping means extendingfrom such block and adapted to hold the end of the work gripped therebya substantial distance from the surface of such block, whereby work mayinitially be wound on said block in one axial direction to engage saidapron and thereafter the accumulated turns will be bodily axiallyshifted in the other direction together with said work-gripping means'5. In mechanism for the drawing of elongated work such as tubing and thelike, including a die and a rotatable block adapted to be driven to windsuch work thereon to draw the same through such die; mounting means forsuch die mounted for oscillation about an axis parallel to the axis ofsuch block, a fluid pressure pistoncylinder assembly operative toreciprocate said mounting means along such first axis, and time delaymeans operative to actuate said assembly thus to reciprocate saidmounting means after an interval following initiation of the drawingoperation by rotation of such block.

6. In mechanism for the drawing of elongated work such as tubing and thelike, including a die and a rotatable block adapted to be driven to windsuch work thereon to draw the same through such die; work gripping meanson such block adapted to grip the leading end of such work comprising amember protruding generally radially of such block, work clamping meanspivotally mounted on said member for swinging movement about a pivotalaxis parallel to the axis of such block, and means adapted to maintainsuch pivotal axis spaced substantially outwardly from the work-engagingsurface of the block when a pull is exerted on said clamping means.

7. In mechanism for the drawing of elongated work such as tubing and thelike, including a rotatable draw block adapted to be driven to wind suchwork thereon; work gripping means on such block adapted to grip theleading end of such work comprising a member mounted for reciprocationparallel to the axis of such block and protruding generally radiallytherefrom, work clamping means pivotally mounted on said member forswinging movement about a pivotal axis parallel to the axis of suchblock and spaced substantially from the work-engaging surface of thelatter, and means adapted to engage and support said member to assistthe latter to resist a strong pull exerted thereon by such work untilsaid member has been reeiprocated a substantial distance parallel to theaxis of such block.

8. In mechanism for the drawing of elongated work such as tubing and thelike, including a rotatable draw block adapted to be driven to wind suchwork thereon; means operative to engage turns of work wound on suchblock to shift them bodily axially thereof, a support on such blockextending parallel to the axis of the latter in the direction such turnsare thus shifted, a member mounted on said support for reciprocationtherealong and adapted to project substantially radially beyond theouter periphery of such block, such block having a slot therein forentry of said member, work gripping means pivotally mounted on saidmember for swinging movement about a pivotal axis parallel to the axisof such block and spaced substantially outwardly from the work-engagingsurface thereof, and additional support ing means for said membermounted on such block and adapted to brace said member on the side fromwhich a pull is adapted to be exerted by such work.

9. In mechanism for the drawing of elongated work such as tubing and thelike, including a rotatable draw block adapted to be driven to wind suchwork thereon; means operative to engage turns of work wound on suchblock to shift them bodily axially thereof, a tubular column on suchblock extending vertically upwardly parallel to the axis of the latterin the direction such turns are thus shifted, an arm sleeved on saidcolumn for reciprocation up and down the same and adapted to projectsubstantially radially beyond the outer periphery of such block, suchblock having a slot therein for entry of said arm, a member pivotallymounted on said arm for swinging movement about a pivotal axis parallelto the axes of said column and such block and spaced substantiallyoutwardly from the work-engaging surface of such block, work-grippingjaws on said member, a counterweight reciprocable within said columnconnected with said arm for relative up-and-down movement, a verticallyextending supporting surface on such block adjacent said arm on the sidefrom which a pull is adapted to be exerted by such work, andanti-friction means on said arm engaging said surface.

10. In mechanism for the drawing of elongated work such as tubing andthe like, including a die and a block mounted for rotation about avertical axis and adapted to be driven to wind such work thereon to drawthe same through such die; a push-up apron encircling the lower end ofsuch block and mounted for rotation therewith but about an axis slightlyinclined to the axis of such block to afford a relative rocking action,whereby turns of work wound on such block may be shifted bodily upwardlythereof, a vertically upwardly extending tubular column on such block,an arm sleeved on said column for reciprocation up and down the same andadapted to extend generally radially of such block, an extension of saidarm mounted on the latter for swinging movement about a vertical axis,work gripping means mounted on said extension for swinging movementabout a vertical axis, stop means adapted to support said arm on theside from which a pull is adapted to be exerted by such work, stop meanson said arm limiting such swinging movement of said extension in thedirection of such pull to substantial alignment with said arm, suchblock having a vertical slot therein for entry of said arm andextension, said work gripping means being spaced substantially outwardlyfrom the work-engaging surface of such block with said arm and extensionthus aligned, a counterweight for said arm, extension, and work grippingmeans reciprocable within said column, a pulley mounted at the top ofsaid column for rotation about a horizontal axis, a cable passing oversaid pulley connecting said arm and counterweight for relative up anddown movement; vertical trunnion mounting means for such die foroscillation of the latter about an axis parallel to the axis of suchblock, cam means on said apron and follower means on said die mountingmeans operative to oscillate said mounting means and such die tomaintain alignment of such die and said work gripping means as suchblock turns during initiation of the drawing operation, a fluid pressurepiston-cylinder assembly operative to lower said die mounting means towind such work toward said push-up apron, and control means for saidassembly adapted to be actuated by rotation of such drum and said apronthus to lower said mounting before said cam means on said apron makes acomplete revolution again to engage said cam follower, whereby work mayinitially be wound on said block in one axial direction to engage saidapron and thereafter the accumulated turns will be bodily axiallyshifted in the other direction together with said work-gripping means.

11. In mechanism for the drawing of elongated work such as tubing andthe like, including a die and a block mounted for rotation about avertical axis and adapted to be driven to wind such work thereon to drawthe same through such die; a push-up apron encircling the lower end ofsuch block and mounted for rotation therewith but about an axis slightlyinclined to the axis of such block to afford a relative rocking action,whereby turns of Work wound on such block may be shifted bodily upwardlythereof, a member protruding generally radially of such block andmounted for vertical reciprocation, such block having a vertical slottherein for entry of said member, work gripping means mounted on saidmember for swinging movement about a vertical axis spaced substantiallyfrom the work-engaging surface of such block; means mounting such diefor oscillation about a vertical axis, cam means on said apron andfollower means on said die mounting means operative to oscillate saidmounting means and such die to maintain alignment of such die and saidwork gripping means as such block turns to ensure a uniform straightpull on such work during initiation of the drawing operation, a fiuidpressure pistoncylinder assembly operative to lower said die mountingmeans from starting position toward said push-up apron to wind such worktoward said apron on such block, control means for said assembly, andmeans on said apron adapted to engage said control means as said apronturns to actuate said assembly to lower said die mounting before saidcam means on said apron makes a complete revolution again to engage androck said cam follower, whereby work may initially be wound on saidblock in one axial direction to engage said apron and thereafter theaccumulated turns will be bodily axially shifted in the other directiontogether with said work-gripping means.

12. In mechanism for the drawing of elongated work such as tubing andthe like, including a die and a rotatable block adapted to be driven towind such work thereon to draw the same through such die; means adjacentone end of such block adapted to engage work wound on such block toforce the turns of work to slide axially of such block, work-grippingmeans on such block mounted for movement axially of such block in adirection away from said work-engaging means, said work gripping meansprojecting a substantial distance outwardly from the work-engagingsurface of such block; means mounting such die for oscillation about anaxis parallel to that of such block, cam means rotatable with such blockadapted to engage said die mounting means to oscillate such die tomaintain alignment of such die and said work-gripping means as suchblock turns to ensure a uniform straight pull on such work duringinitiation of the drawing operation, means operative to shift said diemounting means from starting position toward said work-engaging means ina direction parallel to the axis of such block to wind such work on suchblock toward said work-engaging means, and control means adapted to beactuated in timed relation to rotation of such block operative toactuate said die mounting shifting means to shift said mounting and dieafter initiation of the drawing operation sufficiently before said cammeans makes a complete revolution again to avoid further oscillation ofsaid die mounting means and die, whereby work may initially be wound onsaid block in one axial direction to engage said work-engaging means andthereafter the accumulated turns will be bodily axially shifted in theother direction together with said work-gripping means.

13. In mechanism for the drawing of elongated work such as tubing andthe like, including a die and a rotatable block adapted to be driven towind such work thereon to draw the same through such die; a workgrippiugmeans support on such block mounted for reciprocation parallel to theaxis of such block and adapted to extend rigidly outwardly beyond thework-engaging surface of such block, work-gripping means on said supportspaced substantially from such work-engaging surface of such block;mounting means for such die mounted for oscillation about an axisparallel to the axis of such block, cam means adapted to rotate withsuch block and to engage and oscillate said die mounting means tomaintain such die and said work-gripping means in alignment duringinitiation of the drawing operation, and means operative to shift saidmounting means parallel to such axis of such block during the firstrevolution of such block in the drawing operation to avoid subsequentoscillation of said mounting means by said cam means.

14. In mechanism for the drawing of elongated work such as tubing andthe like, including a die and a retatable block adapted to be driven towind such work thereon to draw the same through such die; work-grippingmeans on such block adapted to grip the leading end of such work,mounting means for such die adapted to be shifted transversely of theaxis of such drum, and power means operative to shift said mountingmeans transversely during initiation of the drawing operation in timedrelation thereto to maintain the work between such die and said grippingmeans out of any pressure contact with the surface of such block longerthan would otherwise be the case.

15. In mechanism for the drawing of elongated work such as tubing andthe like, including a die and a rotatble block adapted to be driven towind such work thereon to draw the same through such die; work-grippingmeans onsuch block adapted to grip and hold the leading end of such workspaced substantially outwardly from the surface of such block, mountingmeans for such die adapted to be shifted transversely of the axis ofsuch drum, and power means positively operative to shift said mountingmeans transversely during initiation of the drawing operation tomaintain the work between such die and said gripping means out of anypressure contact with the surface of such block longer than wouldotherwise be the case.

16. In mechanism for the drawing of elongated work such as tubing andthe like, including a die and a rotatable block adapted to be driven towind such work thereon to draw the same through such die; an arm adaptedto pro trude rigidly beyond the outer work-engaging surface of suchblock, means adapted to support said arm thus rigidly extending duringthe initial stages of the drawing operation and work-gripping meansmounted on said arm spaced substantially outwardly from the surface ofsuch block adapted to grip the leading end of such work to exert adrawing pull thereon, thus postponing contact of such work with suchsurface during the intial stage of the drawing operation.

17. In mechanism for the drawing of elongated work such as tubing andthe like, including a die and a rotatable block adapted to be driven towind such work thereon to draw the same through such die; work-grippingmeans mounted on such block, means adapted rigidly to support saidwork-gripping means spaced substantially outwardly from the surfacethereof, said gripping means being adapt ed to grip the leading end ofsuch Work to exert a drawing pull thereon while postponing contact ofsuch work with such surface during the initial stage of the drawingoperation.

18. In mechanism for the drawing of elongated work such as tubing andthe like, including a block mounted for rotation about a vertical axisand adapted to be driven to wind such work thereon; a vertical tubularcolumn mounted on such block, work gripping means mounted on said columnfor reciprocation therealorlg, a counterweight reciprocable within saidcolumn, and means connecting said work gripping means and counterweightfor relative up-and-down reciprocation.

19. In a draw block mounted for rotation about a vertical axis andhaving work-gripping means mounted thereon for reciprocation parallel tosuch axis; counterweight means connected with said work-gripping meansto facilitate upward movement of the latter, and vertical guide meansfor said work-gripping means extending above the top of said block.

20. In mechanism for the drawing of elongated work such as tubing andthe like, including a die and a rotatable block adapted to be driven toWind such work thereon to draw the same through such die; a memberadapted to extend generally radially outwardly from such block, meanssupporting said member in such position projecting beyond the greatestdiameter of the Work-engaging periphcry of such block and work-grippingmeans pivotally axis parallel to the axis of such block and spacedsubstantially from the surface of such block, said gripping means beingtoo short to contact such surface when swung into a position with suchwork tangential to such surface.

References Cited in the file of this patent UNITED STATES PATENTS TaylorNov. 1, 1910 Smith Jan. 3, 1911 Carroll Feb. 3, 1914 Marvin Apr. 4, 1916McIlvried Sept. 1, 1931

